NJM2890
2ch LOW DROPOUT VOLTAGE REGULATOR
s
GENERAL DESCRIPTION
The NJM2890 is a dual low dropout voltage regulator.
Advanced Bipolar technology achieves low noise, high ripple
rejection and low quiescent current.
s
FEATURES
qHigh
Ripple Rejection
70dB typ. (f=1kHz)
qOutput
Noise Voltage
Vno=30µVrms (Cp=0.01µF)
qOutput
capacitor with 1.0uF ceramic capacitor (Vo≥2.7V)
qOutput
Current
Io(max.)=150mA
×
2ch
qHigh
Precision Output
Vo±1.0%
qLow
Dropout Voltage
0.10V typ. (Io=60mA)
qOperating
Voltage Range +2.5V∼+14V (Vo≤2.0V version)
qON/OFF
Control
(Active High)
qInternal
Short Circuit Current Limit
qInternal
Thermal Overload Protection
qBipolar
Technology
qPackage
Outline
VSP10
s
PIN CONFIGURATION
PIN FUNCTION
1. CONTROL1
2. V
IN
1
3. GND
4. V
IN
2
5. CONTROL2
s
PACKAGE OUTLINE
NJM2890R
1
2
3
4
5
10
9
8
7
6
6. NOISE BYPASS2
7. V
OUT
2
8. GND
9. V
OUT
1
10. NOISE BYPASS1
NJM2890R
s
EQUIVALENT CIRCUIT
V
IN
1/ V
IN
2
Cont1/Cont2
Thermal
Protection
V
OUT
1/ V
OUT
2
Noise Bypass1 /
Noise Bypass2
Bandgap
Reference
GND
NJM2890
s
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
Input Voltage
V
IN
Control Voltage
V
CONT
Power Dissipation
P
D
Operating Temperature
Topr
Storage Temperature
Tstg
(Ta=25°C)
RATINGS
UNIT
+14
V
+14(note 1)
V
320
mW
−40 ∼
+85
°C
−40 ∼
+125
°C
(note 1) When input voltage is less than +14V, the absolute maximum
control voltage is equal to the input voltage.
s
ELECTRICAL CHARACTERISTICS
(Vo>2.0V version :
Only 1CH/2CH : V
IN
=Vo+1V, C
IN
=0.1µF, Co=1.0uF: Vo≥2.7V (Co=2.2uF: Vo≤2.6V), Cp=0.01µF, Ta=25°C)
PARAMETER
SYMBOL
TEST CONDITION
MIN. TYP. MAX. UNIT
Output Voltage
Vo
Io=30mA
-1.0%
+1.0%
V
−
Io=0mA, expect Icont
Quiescent Current
120
180
I
Q
µA
−
Quiescent Current
V
CONT
=0V
100
nA
I
Q(OFF)
−
−
at Control OFF
Output Current
Io
150
200
-
mA
Vo−0.3V
Line Regulation
0.10 %/V
∆Vo/∆V
IN
V
IN
=Vo+1V
∼
Vo+6V, Io=30mA
−
−
Load Regulation
0.03 %/mA
∆Vo/∆Io
Io=0
∼
100mA
−
−
Io=60mA
Dropout Voltage
0.10 0.18
V
∆V
I−O
−
ein=200mVrms,f=1kHz, Io=10mA,
Ripple Rejection
RR
70
dB
−
−
Vo=3V Version
Average Temperature
∆Vo/∆Ta
Ta=0∼85°C, Io=10mA
±50
−
−
ppm/°C
Coefficient of Output Voltage
f=10Hz∼80kHz, Io=10mA,
Output Noise Voltage
V
NO
30
µVrms
−
−
Vo=3V Version
Control Voltage for ON-state V
CONT(ON)
1.6
V
−
−
Control Voltage for OFF-state V
CONT(OFF)
0.6
V
−
−
(Vo≤2.0V version :
Only 1CH/2CH : V
IN
=Vo+1V, C
IN
=0.1µF, Co=2.2uF, Cp=0.01µF, Ta=25°C)
PARAMETER
SYMBOL
TEST CONDITION
Output Voltage
Vo
Io=30mA
Io=0mA, expect Icont
Quiescent Current
I
Q
Quiescent Current
V
CONT
=0V
I
Q(OFF)
at Control OFF
Output Current
Io
Vo−0.3V
Line Regulation
∆Vo/∆V
IN
V
IN
=Vo+1V
∼
Vo+6V, Io=30mA
Load Regulation
∆Vo/∆Io
Io=0
∼
100mA
ein=200mVrms,f=1kHz, Io=10mA,
Ripple Rejection
RR
Vo=1.8V Version
Average Temperature
∆Vo/∆Ta
Ta=0∼85°C, Io=10mA
Coefficient of Output Voltage
f=10Hz∼80kHz, Io=10mA,
Output Noise Voltage
V
NO
Vo=1.8V Version
Control Voltage for ON-state V
CONT(ON)
Control Voltage for OFF-state V
CONT(OFF)
MIN.
-1.0%
−
−
150
−
−
−
−
−
1.6
−
TYP. MAX. UNIT
+1.0%
V
−
120
180
µA
−
200
−
−
75
±50
22
−
−
100
-
0.10
0.03
−
−
−
−
0.6
nA
mA
%/V
%/mA
dB
ppm/°C
µVrms
V
V
(note 2) The above specification is a common specification for all output voltages.
Therefore, it may be different from the individual specification for a specific output voltage.
NJM2890
s
TYPICAL APPLICATION
x
In the case where ON/OFF Control is not required:
CONTROL
R
(0∼300kΩ)
NOISE
BYPASS1
Cp=0.01uF
V
IN
1
V
IN
1
V
OUT
1
1.0uF
OR
2.2uF(Vo≤2.6V)
V
OUT
1
0.1uF
NJM2890
GND
GND
(Ceramic Capacitor)
V
IN
2
V
IN
2
V
OUT
2
1.0uF
OR
2.2uF(Vo≤2.6V)
V
OUT
2
0.1uF
R
(0∼300kΩ)
CONTROL
NOISE
BYPASS2
(Ceramic Capacitor)
Cp=0.01uF
Connect control terminal to V
IN
terminal
The quiescent current can be reduced by using a resistance “R”. Instead, it increases the minimum
operating voltage. For further information, please refer to Figure “Output Voltage vs. Control Voltage”.
NJM2890
y
In use of ON/OFF CONTROL:
CONTROL
R
(0∼300kΩ)
NOISE
BYPASS1
Cp=0.01uF
V
IN
1
V
IN
1
V
OUT
1
1.0uF
OR
2.2uF(Vo≤2.6V)
V
OUT
1
0.1uF
NJM2890
GND
GND
(Ceramic Capacitor)
V
IN
2
V
IN
2
V
OUT
2
1.0uF
OR
2.2uF(Vo≤2.6V)
NOISE
BYPASS2
(Ceramic Capacitor)
V
OUT
2
0.1uF
R
(0∼300kΩ)
CONTROL
Cp=0.01uF
State of control terminal:
•“H”→
output is enabled.
•
“L” or “open”
→
output is disabled.
✱Noise
bypass Capacitance Cp
Noise bypass capacitance Cp reduces noise generated by band-gap reference circuit.
Noise level and ripple rejection will be improved when larger Cp is used.
Use of smaller Cp value may cause oscillation.
Use the Cp value of 0.01uF greater to avoid the problem.
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